Sheoldred, Whispering One [Iconic Masters]

Description

Set:	Iconic Masters
Type:	Legendary Creature — Praetor
Rarity:	Mythic
Cost:	{5}{B}{B}

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
At the beginning of your upkeep, return target creature card from your graveyard to the battlefield.
At the beginning of each opponent's upkeep, that player sacrifices a creature.